So Many Drill Bits…Which One Should You Choose?

With so many types and sizes of drill bits available, you need to know how to pick the perfect drill bit suitable for the job at hand. You also have to consider the type of material used in making the drill and the type of coatings. Each machining operation requires a specific type of drill bit. Let’s look at the various aspects you need to consider when making a choice.

Type of Drill Bit Materials

Cobalt incorporates up to 8 percent of cobalt metal in the drill bit’s base material. This drill bit is ideal for drilling into stainless steel and hard steel.

High-speed steel is an alloy of tungsten, cobalt, vanadium, chromium, iron and carbon. This drill bit is perfect for high-end drilling applications. You can use the drill bit on materials such as steel, cast iron, aluminum and titanium alloy.

Carbide-tipped drill bits maintain their sharpness longer than the other bits. You can opt for these when you wish to drill through tile and masonry applications. You can find out more on drill bit materials on Drill Bit Best, and use the knowledge to make the perfect drill bit purchase.


Go for black oxide if you plan to use the drill on ferrous materials. This is because this finish reduces friction, therefore, increasing chip flow. Opt for Bright finish if you plan to use the drill bit on aluminum, woods and plastics. Titanium carbonitride is an ideal coating for cast iron, stainless steel, and aluminum. The drill bit with this coating is tougher and more wear resistant compared to other coatings.

Titanium aluminum nitride is ideal for handling nickel-based materials, titanium and high-alloy carbon steel. Don’t use this drill bit on aluminum.

The Design

Choose a drill point angle depending on the purpose of the hole, the metal type you are handling and the specifications you need for the finished hole. The 118° angle drill is most common on Jobber drills and is ideal for drilling into aluminum. On the other hand, the 135° self-centering drill point angle is ideal for drilling faster, and is suitable for hardened materials like stainless steel.

Drill bit lengths come into play as well. Shorter lengths are more rigid and don’t break easily. They are also more precise. Use the short bits when you have to drill in tighter, confined areas.


Choosing the right drill bit for a task is a vital part of any drilling operation. Make sure you match the size, angle, material and coatings to the job at hand. Matching the drill bit to the application extends the life of your drill bit and improves productivity.